"I believe the bolts used to mount the door hinges to the body
are the same. "
I don't believe they are......and '65 and '66 also used different size Door hinge Bolts between the two years. '66's actually used smaller diameter bolts than '65's did. A fact that most don't know.
I agree with Woodchuck. I had to replace one of mine. Got a grade 8, 3/16 bolt, washer and lock washer at the hardware store. Way I figured it, if 3 of the 4 are OK and holding the plate where it belongs, the 4th, as long as it's strong and tight enough, should hold things together. Mine has been installed this way since 2016. No issues.
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